Use of filtered combustion light and backlit high-speed images in combustion stability studies

Pomeroy, Brian; Wierman, Matthew; Anderson, William E.

doi:10.1051/eucass/201304525

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…It is an evolutionary development from a JP-8/H 2 O 2 combustor previously tested at Purdue and uses the same internal geometry as that combustor. 6,7 The combustor geometry is sized to target a 1W transverse mode frequency of 2000Hz and the higher harmonics of that mode. The converging nozzle shape is designed to dampen longitudinal modes.…”

Section: A Transverse Instability Combustormentioning

confidence: 99%

“…The former length is similarly scaled to match stable CVRC operation and matches the post length used in the previous chambers. [6][7][8] The latter length is scaled to the post length yielding the most unstable operation in the CVRC (5.5 inches). 3 Gaseous CH 4 was chosen as the fuel on the basis of its known reaction pathways for computational models to match.…”

Section: A Transverse Instability Combustormentioning

confidence: 99%

“…3(a)) are ox-centered coaxial shear elements with a simplified geometry from the CVRC injector design. 6,7 The oxidizer post inlets have a single venturi-like orifice ( Fig. 3(b)) to choke the flow and set a sonic boundary.…”

Section: A Transverse Instability Combustormentioning

confidence: 99%

See 2 more Smart Citations

Stability Characterization of a High Pressure Transverse Combustor with Discretely Variable Oxidizer Post Lengths

Wierman¹,

Hallum²,

Anderson³

2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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A two-dimensional chamber containing seven ox-centered shear coaxial injector elements was designed to generate and modulate an unsteady transverse flowfield. A single Study element was placed in the middle of this unsteady flowfield so its response can be measured using pressure measurement and high speed imagery. The initial characterization of this combustor entailed the effect of post length configurations on pressure amplitude. With all other conditions held constant, a long oxidizer post configuration was stable, and a short oxidizer post configuration was unstable. These post lengths were scaled from a comparable longitudinal combustor and have consistent stability behavior for the individual scaled post lengths. Phase lag behavior between the high frequency measurements in the oxidizer posts and the combustion chamber indicated that consistent phase lags near half of the chamber acoustic mode period between posts and local chamber regions were necessary to sustain a high amplitude unsteady flowfield, suggesting a coupling of post resonance with the chamber unsteady flowfield. a

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Section: A Transverse Instability Combustormentioning

confidence: 99%

Section: A Transverse Instability Combustormentioning

confidence: 99%

See 1 more Smart Citation

Stability Characterization of a High Pressure Transverse Combustor with Discretely Variable Oxidizer Post Lengths

Wierman¹,

Hallum²,

Anderson³

2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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Development of combustion response functions in a subscale high-pressure transverse combustor

Wierman

Pomeroy

Anderson

2016

Progress in Propulsion Physics

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Combustion response functions describe the magnitude and time lag behavior of a §ame in response to unsteady pressure and velocity. By understanding the feedback between unsteady §ow¦elds and heat release, the growth and decay of combustion instability can be better predicted. An automated data isolation and reduction method has been developed to generate meaningful graphical combustion response functions from a combination of pressure amplitude and various image analysis metrics. It was developed and tested using pressure measurements and high-speed imaging of combustion light taken from a single element at the midspan of an unstable high-pressure subscale transverse combustor. The code was used to isolate time slices of near stationary pressure amplitude and to process the corresponding images into combustion response approximated by aggregate intensity, intensity weighted spatial center, Proper Orthogonal Decomposition (POD), and Dynamic Mode Decomposition (DMD). Overall, the generated combustion response functions generally agreed with expected behavior of an element located at a ¦rst width (1W) velocity antinode and second width (2W) pressure antinode. Results from both POD and DMD successfully isolated the prominent spatial and temporal light emission behavior.

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Detailed Measurement of Oxidizer-Rich Staged Combustion Injector Dynamics in Model Rocket Combustors

Bedard¹,

Gejji²,

Anderson³

et al. 2022

AIAA Journal

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Use of filtered combustion light and backlit high-speed images in combustion stability studies

Cited by 5 publications

References 7 publications

Stability Characterization of a High Pressure Transverse Combustor with Discretely Variable Oxidizer Post Lengths

Stability Characterization of a High Pressure Transverse Combustor with Discretely Variable Oxidizer Post Lengths

Development of combustion response functions in a subscale high-pressure transverse combustor

Detailed Measurement of Oxidizer-Rich Staged Combustion Injector Dynamics in Model Rocket Combustors

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